Sky High Car Audio

Sky High Car Audio FXB 2600.4 Compact 4-Channel Amplifier

Name: Sky High Car Audio FXB 2600.4 Compact 4-Channel Amplifier
Brand: Sky High Car Audio
SKU: SHCA-FXB-2600-4
Price: 344.95 USD
Availability: OutOfStock

$344.95 USD

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Sky High Car Audio FXB 2600.4 Compact 4-Channel Amplifier

Sold by AudioSellerz.com

The Sky High Car Audio FXB 2600.4 Compact 4-Channel Amplifier delivers serious full-range power for mids, midbass speakers, compression drivers, horns, and other high-output speaker systems without requiring a large amplifier rack.

At 14.4 volts, the FXB 2600.4 produces 650 watts RMS per channel at 2 ohms or 425 watts RMS per channel at 4 ohms. When more power into fewer loads is needed, the amplifier can be bridged to produce 1,350 watts RMS per bridged channel at 4 ohms.

All of that power is packed into a compact chassis measuring only 5.9 inches wide, 8.35 inches long, and 2.1 inches tall. That makes the FXB 2600.4 a strong option for car and truck audio, motorcycle audio, powersports systems, behind-seat installations, under-seat installations, stealth builds, and other applications where mounting space is limited.

Browse more equipment in the Sky High Car Audio collection, compare other 4-channel car audio amplifiers, or shop our complete selection of car audio speakers, mids, midbass drivers, tweeters, and horns.

FXB 2600.4 Power Ratings at 14.4 Volts

Configuration	RMS output
Four channels at 2 ohms	650 watts RMS × 4
Four channels at 4 ohms	425 watts RMS × 4
Bridged at 4 ohms	1,350 watts RMS per bridged channel
Combined output at 2 ohms	2,600 watts RMS
Minimum impedance per channel	2 ohms
Minimum bridged impedance	4 ohms

Published power ratings are measured at 14.4 volts. Actual output depends on system voltage, final impedance, input signal, wiring, installation, tuning, speaker load, and available charging current.

Four Powerful Full-Range Channels

The FXB 2600.4 can power four independent speaker channels while delivering substantially more output than a basic door-speaker amplifier. Its 10 Hz–25 kHz published frequency response allows it to operate as a full-range amplifier for several different system layouts.

Possible applications include:

Four high-power midrange or full-range speakers
Multiple speakers wired to a safe 2-ohm load on each channel
Separate channels for mids, midbass drivers, compression drivers, or horns
High-output motorcycle and powersports speaker systems
Modern vehicle upgrades where amplifier space is limited
A combination of independent and bridged channels
Two bridged 4-ohm loads requiring substantially more power

The correct system layout depends on the speakers’ RMS ratings, impedance, frequency range, crossover requirements, and the number of speakers connected to each channel.

Flexible Bridged Configuration

The FXB 2600.4 is fully bridgeable at 4 ohms. Bridging combines a pair of amplifier channels to produce up to 1,350 watts RMS into a compatible 4-ohm load.

The amplifier may be configured with:

Four individual channels
One bridged channel with the remaining channels operating independently
Two bridged channels

Do not bridge the amplifier into a load below 4 ohms. Each individual channel has a 2-ohm minimum impedance, while each bridged channel requires a minimum 4-ohm load.

Compact Design for Tight Installations

The FXB 2600.4 measures only 5.9 × 8.35 × 2.1 inches. Its compact size gives builders more mounting flexibility in vehicles where a traditional high-power four-channel amplifier may be difficult to install.

Before ordering, measure the intended mounting location and leave room for:

Power and ground connections
Speaker-wire connections
RCA cables and input controls
Adjustment of gain and crossover settings
Secure mounting hardware
Airflow around the amplifier
Proper operation of the internal cooling fan

A compact amplifier still needs adequate ventilation. Do not bury the amplifier beneath carpet, insulation, upholstery, or other materials that can trap heat or obstruct the cooling system.

Sky High FXB 2600.4 Features

Compact Class D full-range 4-channel amplifier
2,600 watts RMS combined output at 2 ohms
650 watts RMS per channel at 2 ohms
425 watts RMS per channel at 4 ohms
Fully bridgeable at 4 ohms
1,350 watts RMS per bridged channel at 4 ohms
2-ohm minimum impedance per individual channel
4-ohm minimum impedance when bridged
Stable with electrical systems operating up to 16.8 volts
Adjustable high-pass crossover
Adjustable low-pass crossover
Onboard clipping indicator
Internal active cooling fan
10 Hz–25 kHz full-range frequency response
0.4–6-volt low-level input range
95 dB signal-to-noise ratio
Greater than 180 damping factor
Less than 0.1% total harmonic distortion
85% published efficiency at rated output
Thermal protection
Overload protection
Short-circuit output protection
Voltage-input protection
150-amp fuse rating
Compatible with the SHCA modular mounting ecosystem
Compatible with SHCA Universal Amp Key mounting options
Optional passive-cooling and color configurations

FXB 2600.4 Specifications

Amplifier type	Class D full-range 4-channel amplifier
Minimum impedance per channel	2 ohms
Minimum bridged impedance	4 ohms
Maximum supported voltage	16.8 volts
Frequency response	10 Hz–25 kHz
Low-level input range	0.4–6 volts
Signal-to-noise ratio	95 dB
Damping factor	Greater than 180
Total harmonic distortion	Less than 0.1%
Published efficiency	85% at rated output
Fuse rating	150 amps
Cooling	Internal active cooling fan
Dimensions	5.9 × 8.35 × 2.1 inches

Speaker and Impedance Matching

This amplifier makes enough power to damage speakers quickly if the system is wired or tuned incorrectly. Confirm the RMS power handling and impedance of every connected speaker before applying power.

When multiple speakers are connected to one channel, calculate the final impedance seen by that channel. Do not assume the impedance remains the same when speakers are wired together.

For individual-channel operation:

Each channel must remain at 2 ohms or higher.
At 2 ohms, each channel can produce up to 650 watts RMS.
At 4 ohms, each channel can produce up to 425 watts RMS.

For bridged operation:

Each bridged channel must remain at 4 ohms or higher.
Each bridged channel can produce up to 1,350 watts RMS at 4 ohms.
Confirm the correct bridged terminals before connecting the speakers.

Crossover and Speaker Protection

The adjustable high-pass and low-pass crossovers allow the amplifier to be configured for different full-range speaker applications. Correct crossover settings are critical when using this much power.

Smaller speakers, tweeters, horns, and compression drivers should never be allowed to reproduce frequencies below their safe operating range. Midrange and midbass speakers also require crossover settings appropriate for their size, installation, RMS rating, and intended use.

Use the Audio Sellerz speaker crossover and tuning guide to learn how high-pass filters, low-pass filters, gain, and equalization work together.

Gain Setting and Clipping

The FXB 2600.4 includes an onboard clipping indicator to help during setup and system monitoring. However, the indicator does not prove that the signal entering the amplifier is clean.

Clipping may begin at the radio, line-output converter, equalizer, or digital signal processor before it reaches the amplifier. Set the entire signal chain correctly and begin with heavy EQ boosts turned off.

Gain is not a volume control. It should be adjusted to match the amplifier to the clean output voltage of the source unit or processor.

For additional help, read our guide explaining how to set amplifier gain without damaging your equipment.

Wiring and Electrical Support

The FXB 2600.4 has a published 150-amp fuse rating. Use true-spec power and ground cable, a quality fuse holder, properly crimped terminals, and secure high-current connections.

The main power wire should be fused near the battery. Keep the amplifier ground short and connect it securely to clean bare metal or another verified grounding point.

Sky High does not publish the amplifier’s power-terminal wire capacity on the current product page. Verify the terminal size before purchasing an amplifier kit specifically for this model.

Browse available car audio amplifier wiring kits or shop power wire, ground wire, speaker wire, and installation accessories.

Electrical requirements depend on the total system power, listening habits, vehicle, cable length, system voltage, battery capacity, alternator output, and the other equipment in the build. If voltage falls heavily under load, inspect and upgrade the electrical system instead of increasing amplifier gain.

FXB 2600.4 Frequently Asked Questions

How much power does the FXB 2600.4 produce?

At 14.4 volts, it produces 650 watts RMS × 4 at 2 ohms, 425 watts RMS × 4 at 4 ohms, or 1,350 watts RMS per bridged channel at 4 ohms.

Can the FXB 2600.4 be bridged?

Yes. It is fully bridgeable at a minimum load of 4 ohms per bridged channel.

Can it run at 1 ohm per channel?

No 1-ohm rating is published for this amplifier. The minimum impedance is 2 ohms per individual channel and 4 ohms per bridged channel.

Does this amplifier include a bass knob?

Sky High does not list a bass knob or remote-level controller as included equipment for the FXB 2600.4.

Does it have a clipping indicator?

Yes. The amplifier has an onboard clipping indicator to assist with setup and monitoring.

Can it power midrange speakers, midbass drivers, tweeters, or horns?

Yes, when the speakers’ power handling and impedance are matched correctly and safe crossover settings are used. Dedicated tweeters and compression drivers may require additional passive or active crossover protection.

Can it be used in a motorcycle or powersports system?

Yes. Its compact chassis is designed for applications where space is limited. The amplifier still requires secure mounting, proper ventilation, weather protection, correct wiring, and adequate electrical support.

Can it operate on a 16-volt electrical system?

Sky High lists the amplifier as stable up to 16.8 volts. Every device connected to the electrical system must be compatible with the selected operating voltage.

What fuse rating does Sky High publish?

Sky High publishes a 150-amp fuse rating for the FXB 2600.4.

Need Help Planning Your Speaker System?

If you need help matching the FXB 2600.4 with your speakers, channel layout, final impedance, crossovers, wiring, or electrical system, contact Audio Sellerz through the website live chat. We are a real car audio shop and can help you plan the complete system before ordering.